@mixin center {
    -webkit-box-pack: center;
    -ms-flex-pack: center;
    -webkit-justify-content: center;
    justify-content: center;
    -webkit-box-align: center;
    -ms-flex-align: center;
    -webkit-align-items: center;
    align-items: center;
}

@mixin img-move($arg) {
    -webkit-transform: translateX($arg);
    -moz-transform: translateX($arg);
    -ms-transform: translateX($arg);
    transform: translateX($arg);
}

@mixin img-move-time($arg) {
    -webkit-transition: -webkit-transform $arg;
    -moz-transition: transform $arg, -moz-transform $arg;
    transition: transform $arg;
}

@mixin img-change-scale($arg) {
    -webkit-transform: scale($arg);
    -moz-transform: scale($arg);
    -ms-transform: scale($arg);
    -o-transform: scale($arg);
    transform: scale($arg);
}

@mixin img-change-scale-time($arg) {
    -webkit-transition: transform $arg;
    -moz-transition: transform $arg;
    -o-transition: transform $arg;
    transition: -webkit-transform $arg;
    transition: transform $arg;
    transition: transform $arg, -webkit-transform $arg;
}